Worried Girl, the Family Medical Leave Act is your best bet. It should cover days that you have to take off work to be with your mom. If you were living with her and acting as a live-in caregiver, you could get compensation for that from the State. But I know that is not the case.
ERs do not keep medical records. They always start a new chart when they see a patient. However, some hospitals/clinics like Mayo are paperless. They can pull up a patient's medical records on the computer, regardless of who they are seeing. This is much more efficient, as they can see what meds have been prescribed, what the primary diagnosis is, dates of hospitalizations, known allergies, etc. Without this medical record access, it is important to have on hand names/dosages of current medications, diagnoses, dates of hospitalizations and what they were for, etc.
Another thing that shouldn't be a part of medicine, but truthfully is: They are less inclined to run tests, spend time, etc., with a practicing alcoholic or drug addict, particularly if this patient is a "revolving door" case. Some doctors feel it is a waste of time to treat this type of patient and resent having to do so.